6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-08-05 13:26:55 +00:00
Code Issues Projects Releases Wiki Activity

Add RegionPass support.

Browse Source 
A RegionPass is executed like a LoopPass but on the regions detected by the
RegionInfo pass instead of the loops detected by the LoopInfo pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116905 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Tobias Grosser
2010-10-20 01:54:44 +00:00
parent 3e26c3c7d4
commit 6551360535
8 changed files with 535 additions and 1 deletions
Download Patch File Download Diff File Expand all files Collapse all files

87
docs/WritingAnLLVMPass.html
View File

@@ -51,6 +51,14 @@
<li><a href="#doFinalization_loop">The <tt>doFinalization()
</tt> method</a></li>
</ul></li>
<li><a href="#RegionPass">The <tt>RegionPass</tt> class</a>
<ul>
<li><a href="#doInitialization_region">The <tt>doInitialization(Region *,
RGPassManager &amp;)</tt> method</a></li>
<li><a href="#runOnRegion">The <tt>runOnRegion</tt> method</a></li>
<li><a href="#doFinalization_region">The <tt>doFinalization()
</tt> method</a></li>
</ul></li>
<li><a href="#BasicBlockPass">The <tt>BasicBlockPass</tt> class</a>
<ul>
<li><a href="#doInitialization_fn">The <tt>doInitialization(Function
@@ -134,6 +142,7 @@ the <tt><a href="#ModulePass">ModulePass</a></tt>, <tt><a
href="#CallGraphSCCPass">CallGraphSCCPass</a></tt>, <tt><a
href="#FunctionPass">FunctionPass</a></tt>, or <tt><a
href="#LoopPass">LoopPass</a></tt>, or <tt><a
href="#RegionPass">RegionPass</a></tt>, or <tt><a
href="#BasicBlockPass">BasicBlockPass</a></tt> classes, which gives the system
more information about what your pass does, and how it can be combined with
other passes. One of the main features of the LLVM Pass Framework is that it
@@ -805,6 +814,84 @@ program being compiled. </p>
</div>
<!-- ======================================================================= -->
<div class="doc_subsection">
<a name="RegionPass">The <tt>RegionPass</tt> class </a>
</div>
<div class="doc_text">
<p> <tt>RegionPass</tt> is similar to <a href="#LoopPass"><tt>LoopPass</tt></a>,
but executes on each single entry single exit region in the function.
<tt>RegionPass</tt> processes regions in nested order such that the outer most
region is processed last. </p>
<p> <tt>RegionPass</tt> subclasses are allowed to update the region tree by using
the <tt>RGPassManager</tt> interface. You may overload three virtual methods of
<tt>RegionPass</tt> to implementing your own region pass is usually. All these
methods should return true if they modified the program, or false if they didn not.
</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="doInitialization_region">The <tt>doInitialization(Region *,
RGPassManager &amp;)</tt>
method</a>
</div>
<div class="doc_text">
<div class="doc_code"><pre>
<b>virtual bool</b> doInitialization(Region *, RGPassManager &amp;RGM);
</pre></div>
<p>The <tt>doInitialization</tt> method is designed to do simple initialization
type of stuff that does not depend on the functions being processed. The
<tt>doInitialization</tt> method call is not scheduled to overlap with any
other pass executions (thus it should be very fast). RPPassManager
interface should be used to access Function or Module level analysis
information.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="runOnRegion">The <tt>runOnRegion</tt> method</a>
</div>
<div class="doc_text">
<div class="doc_code"><pre>
<b>virtual bool</b> runOnRegion(Region *, RGPassManager &amp;RGM) = 0;
</pre></div><p>
<p>The <tt>runOnRegion</tt> method must be implemented by your subclass to do
the transformation or analysis work of your pass. As usual, a true value should
be returned if the region is modified. <tt>RGPassManager</tt> interface
should be used to update region tree.</p>
</div>
<!-- _______________________________________________________________________ -->
<div class="doc_subsubsection">
<a name="doFinalization_region">The <tt>doFinalization()</tt> method</a>
</div>
<div class="doc_text">
<div class="doc_code"><pre>
<b>virtual bool</b> doFinalization();
</pre></div>
<p>The <tt>doFinalization</tt> method is an infrequently used method that is
called when the pass framework has finished calling <a
href="#runOnRegion"><tt>runOnRegion</tt></a> for every region in the
program being compiled. </p>
</div>
<!-- ======================================================================= -->